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Base complementarity between the three base pairs of mRNA codon and the tRNA anticodon is not a failsafe mechanism. Inaccuracies can range from a single mismatch to no correct base pairing at all. The free energy difference between the correct and nearly correct base pairs can be as small as 3 kcal/ mol. With complementarity being the only proofreading step, the estimated error frequency would be one wrong amino acid in every 100 amino acids incorporated. However, error frequencies observed in...
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Translational regulation in prokaryotes ensures efficient protein synthesis by controlling ribosome access to mRNA. This regulation is mediated by secondary RNA structures, including translational riboswitches, RNA thermometers, and small RNAs (sRNAs), which respond to intracellular and environmental signals to modulate gene expression.Translational RiboswitchesRiboswitches in the leader region of mRNAs can regulate translation by altering the accessibility of the Shine-Dalgarno (SD) sequence,...
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The large ribosomal subunit has several important structures essential to translation. These include the peptidyl transferase center (PTC) - which is the site where the peptide bond is formed - and a large, internal, water-filled tube through which the nascent polypeptide moves. This latter structure is called the Peptide Exit Tunnel, and it begins at the PTC and spans the body of the large ribosomal subunit. During translation, as the nascent polypeptide chain is synthesized, it passes through...
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Functional Translational Readthrough: A Systems Biology Perspective.

Fabian Schueren1, Sven Thoms1

  • 1University Medical Center, Department of Child and Adolescent Health, University of Göttingen, Göttingen, Germany.

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Functional translational readthrough (FTR) in humans is gaining attention. Systems biology methods are key to discovering these protein extensions that continue past the stop codon.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Systems Biology

Background:

  • Translational readthrough (TR) is a biological process where protein synthesis continues beyond a standard stop codon.
  • Recent advancements in systems biology have enabled the identification of functional translational readthrough (FTR) in human genes.
  • FTR results in the synthesis of elongated proteins with potentially novel functions.

Purpose of the Study:

  • To review recent developments in translational readthrough research.
  • To highlight the identification of functional translational readthrough in human genes.
  • To discuss the systems biology methods driving these discoveries.

Main Methods:

  • Review of current literature on translational readthrough.
  • Analysis of systems biology approaches applied to gene expression.
  • Case studies of identified human genes with FTR.

Main Results:

  • The identification of the first human genes exhibiting functional translational readthrough.
  • Demonstration of systems biology as a powerful tool for discovering TR events.
  • Elucidation of the mechanism by which FTR extends protein functionality.

Conclusions:

  • Translational readthrough is a significant biological mechanism in humans.
  • Systems biology is crucial for uncovering complex genetic and translational events.
  • Further research into FTR can reveal new protein isoforms and functions.